ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: jfreitas <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/06/30 11:23:47 by jfreitas          #+#    #+#             */
/*   Updated: 2019/11/21 11:28:28 by jfreitas         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(char const *str)
{
	unsigned int	res;
	unsigned int	neg;

	neg = 1;
	res = 0;
	while (*str && (*str == ' ' || *str == '\n' || *str == '\t' ||
				*str == '\v' || *str == '\r' || *str == '\f'))
		str++;
	if (*str == '-' || *str == '+')
	{
		if (*str == '-')
			neg = -1;
		str++;
	}
	while (*str && *str >= '0' && *str <= '9')
	{
		res = res * 10 + (*str - 48);
		str++;
	}
	return (res * neg);
}